Catnip (catmint (common)) care

Light

Catnip is a sun-lover and needs the brightest spot in the home to thrive. 6 hours of direct sun; tolerates partial shade. Indoors that almost always means a south or west-facing windowsill in the northern hemisphere. Plants moved abruptly from low light to direct sun will scorch — acclimate them over 7-10 days by giving a little more sun each day.

Watering

Water catnip weekly watering. The actual day count varies with pot size, light level, and the season — the finger test (or, better, lifting the pot to feel its weight) is more reliable than a calendar. Empty any drainage saucer after watering so the pot is never sitting in water. Drought-tolerant once established.

Soil and pot

Catnip grows best in free-draining loam. pH 6.1-7.8; tolerates poor soils. A pot with a working drainage hole is non-negotiable for this species — even free-draining mix will turn soggy in a closed planter. If you love the look of a decorative pot without a hole, use it as a cachepot around an inner nursery pot you can lift out to water.

Humidity and temperature

Catnip sits happiest at around 40-70% (outdoor) humidity and 15-26°C (60-80°F). Outdoor humidity rarely matters. If you keep the room above 15 year-round and avoid placing the plant near a cold draught, a hot radiator, or an air-conditioning vent, you have already handled the two biggest indoor stressors.

Fertilising

Feed catnip sparingly. None needed in average soil. Skip fertiliser entirely on a stressed, recently-repotted, or actively wilting plant — fertiliser salts make damage worse, not better. Wait for a round of healthy new growth before resuming a feeding rhythm.

Common problems

Below are the issues we see most often on catnip in the Growli community. Each is annotated with the most common cause so you know where to start.

• Cats roll on the plant and crush it — Plant in a wire cloche or grow in a hanging pot until established.
• Self-seeds aggressively — Cut back before seed sets.
• Leggy after flowering — Shear back hard for a fresh flush.
• Powdery mildew — Improve air flow.
• Aphids — Rinse off; ladybirds clean up quickly.

Companion plants

Catnip pairs well with Cabbage, Squash, and Bean. These are species with similar light and water needs, so you can grow them in the same bed or container without conflict.

Propagation

Stem cuttings, division, or seed. Propagation is the cheapest, most satisfying way to expand a collection — and it doubles as insurance against losing a mature plant to an accident. Take a backup cutting once the parent is established and healthy.

Toxicity to pets

Catnip is pet-safe. Nepeta cataria is non-toxic to cats and dogs and listed by ASPCA as safe. The mild euphoria it causes in some cats is harmless and short-lived. If you keep cats, dogs, or curious children in the house, weigh placement carefully — a high shelf or a hanging planter is enough for casual safety. For severe ingestion incidents, call your local vet and the ASPCA Animal Poison Control Center (in the US, 888-426-4435).

Pet-safety status is sourced from the ASPCA Toxic and Non-Toxic Plant List, which catalogues the most-asked-about plants for cats, dogs, and horses.

Catnip deep-dive guides

Every aspect of catnip care, each with its own calibrated guide:

• Catnip watering schedule
• Catnip light requirements
• Best soil mix for catnip
• Catnip fertilizing guide
• When to repot catnip
• How to propagate catnip
• Catnip growth rate & size
• Catnip cold hardiness
• Catnip temperature & humidity
• Is catnip toxic to cats & dogs?

Related guides

Catnip is also commonly called catmint (common) or catswort.

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• Mint care — light, water and common problems
• All 200 plant care guides in the Growli library